i add vias to copper plane at diffrent places to form a solid plane and interconnect planes
the method used by me is as follows
1) draw a route from that net and add via and press CTRL+left click
2) Select and glude that via.
3) Select that via and press CTRL+C.
4) A copy of that via will stick to ur mouse pointer.
5) now u can click anywhere u want, to place via.
Hi,v_kumar. Thanks for your reply. I am going to add some vias along the microstrip feeding line to the antenna to suppress surface wave. That's why the vias are not connected to any rounting traces.